/ Dictionary / Index I imposture: Meaning and Definition of Find definitions for: im•pos•ture Pronunciation: (im-pos'chur), [key] — n. the action or practice of imposing fraudulently upon others. deception using an assumed character, identity, or name, as by an impostor. an instance or piece of fraudulent imposition. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: imposture (Thesaurus) impostor imposure Related Content Daily Word Quiz: penury Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language